Which of the following statements describes pressure at the centre of a hurricane?
A. It is lower than the surroundings at the surface and higher than the surroundings aloft.
B. It is lower than the surroundings at the surface and lower than the surroundings aloft.
C. It is higher than the surroundings at the surface and lower than the surroundings aloft.
D. It is higher than the surroundings at the surface and higher than the surroundings aloft.
Answer: A
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Many ore deposits result from contact metamorphism during which hot, ion-rich fluids ____
A)migrate from surrounding rock into igneous intrusions B)migrate from igneous intrusions into the surrounding rock C)melt the surrounding rock which precipitates the ore D)reach Earth's surface forming ore deposits as they move E)become electrically neutral and react chemically with the surrounding rock
Assuming the legislators are considering the cost-effectiveness of the legislation and want to maximize net benefit, what level of pollution reduction would they most logically legislate?
A) No reduction, since there is a cost to all levels of pollution reduction. B) 60% reduction C) 80% reduction D) 90% reduction
The ________ part of the Rockies receives the most precipitation
A) Western B) Eastern C) Northern D) Southern
In 2014, approximately what was the size of the U.S. economy?
A) $10.4 trillion B) $17.4 trillion C) $17.6 trillion D) $14.7 trillion E) none of the above